From 202a674bb8b7d7867503224857a2b0e04617d9b3 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Mon, 23 Mar 2015 11:06:11 +0100 Subject: armv8: semihosting: add a command to load semihosted images Instead of sprinkling custom code and calls over the Vexpress64 boardfile, create a command that loads images using semihosting just like we would load from flash memory of over the network, using a special command: smhload
This will make it possible to remove some custom calls and code and make the boot easier. Signed-off-by: Linus Walleij --- doc/README.semihosting | 25 +++++-------------------- 1 file changed, 5 insertions(+), 20 deletions(-) (limited to 'doc/README.semihosting') diff --git a/doc/README.semihosting b/doc/README.semihosting index 7248560..c016a4f 100644 --- a/doc/README.semihosting +++ b/doc/README.semihosting @@ -30,25 +30,10 @@ vexpress_aemv8a.h but differentiate the two models by the presence or absence of CONFIG_BASE_FVP. This change is tested and works on both the Foundation and Base fastmodel simulators. -The level of semihosting support is minimal, restricted to just what it -takes to load images to memory. If more semihosting functionality is -required, such as file seek, outputting strings, reading characters, etc, -then it can be easily added later. +The semihosting code adds a command: -We require that the board include file define these env variables: -- kernel_name e.g. "uImage" -- kernel_addr_r e.g. "0x80000000" -- initrd_name e.g. "ramdisk.img" -- initrd_addr_r e.g. "0x88000000" -- fdt_name e.g. "devtree.dtb" -- fdt_addr_r e.g. "0x83000000" + smhload
[env var] -Optionally, "fdt_high" and "initrd_high" can be specified as per -their rules for allowing or preventing copying of these images. - -For the "fdt chosen" startup macro, this code will then define: -- initrd_end (based on retrieving initrd_addr_r plus actual initrd_size) - -We will then load the kernel, initrd, and fdt into the specified -locations in memory in a similar way that the ATF fastmodel code -uses semihosting calls to load other boot stages and u-boot itself. +That will load an image from the host filesystem into RAM at the specified +address and optionally store the load end address in the specified +environment variable. -- cgit v1.1